Find the sum of the series upto 10 terms: `4+8+12+....`

Find the sum of the series upto infinite terms (3)/(4)-(5)/(4^(2))+(3)/(4^(3))-(5)/(4^(4))+...

find the sum of the series upto n terms 1+(1+2)/(2)+(1+2+3)/(3)+(1+2+3+4)/(4)+

Find the sum of the following series to n term: 1. 2. 4+2. 3. 7+3. 4. 10+ .......

Find the sum of the series 1+4+10+22+...

Find the sum of the following series to n term: 2^3+4^3+6^3+8^3+..........

Find the sum of the series 1+4+7+10+....... to 40 terms.

Find sum of the series upto n terms 1+(1+2)/(2)+(1+2+3)/(3)+(1+2+3+4)/(4)+

The ratio of the 4 th to the 12 th terms of a G.P with positive common ratio is If the sum 256 of the two terms is 6168, find the sum of the series to 8 terms.